MnO_2电极上氧还原的电催化机理

电化学（中英文） ›› 2003, Vol. 9 ›› Issue (3): 336-343.

MnO_2电极上氧还原的电催化机理

曹余良,杨汉西,艾新平,肖利芬

武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072

收稿日期:2003-08-28 修回日期:2003-08-28 出版日期:2003-08-28 发布日期:2003-08-28

The Mechanism of Electrocatalytic Reduction of Oxygen on Manganese Dioxide

CAO Yu_liang,YANG Han_xi,AI Xin_ping,XIAO Li_fen

( College of chemistry & molecule science,Wuhan University,Wuhan 430072,China

Received:2003-08-28 Revised:2003-08-28 Published:2003-08-28 Online:2003-08-28

摘要/Abstract

摘要： 研究了MnO2 催化氧还原的电催化性质 ,通过比较MnO2 的自还原和催化氧还原的相关性 ,结合极化曲线分析和中间产物检测 ,提出了氧在MnO2 上电催化机理 .根据这一机理 ,MnO2 首先还原为MnOOH ,随之氧的还原通过化学氧化MnOOH ,两者协同进行 .依此导出的极化曲线形式能够较好地解决实验中观测到的动力学特征

关键词: 氧还原, 电催化, 二氧化锰, 反应机理

Abstract: The oxygen electroreduction on the MnO 2 electrode was investigated by analysis of the polarzation properties of oxygen reduciton and its dependence on MnO 2 discharge state,in combination with the characterization of discharge intermediate and the kinetic parameters of the oxygen reduction.Based on the experimental observation and mechanistic analysis,it was suggested that the reduction of oxygen was closely related to the discharge behaviors of MnO 2 .When MnO 2 was electrochimically reduced to MnOOH,it was immediately oxidized by oxygen molecules. Thus the oxygen reduction proceeds through continuous oxidation of the discharge product of MnO 2 and the MnO 2 catalyst behaves like an eletron mediator to provide rapidly the reduction reagent via its discharge.The I_E relationship derived from this mechanism can very well explain the observed polarization properties of oxygen reduction on MnO 2 electrode.

Key words: Oxygen reduction, Electrocatalysis, Manganese dioxide, Reaction mechanism

中图分类号:

O646

曹余良,杨汉西,艾新平,肖利芬. MnO_2电极上氧还原的电催化机理[J]. 电化学（中英文）, 2003, 9(3): 336-343.

CAO Yu_liang,YANG Han_xi,AI Xin_ping,XIAO Li_fen . The Mechanism of Electrocatalytic Reduction of Oxygen on Manganese Dioxide[J]. Journal of Electrochemistry, 2003, 9(3): 336-343.

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https://electrochem.xmu.edu.cn/CN/Y2003/V9/I3/336

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